I clean the UIM by scraping the EGR passages first and then I take it to the carwash and blow the crap out of the runners.
B-12 CHEMTOOL® CARBURETOR CHOKE CLEANER works well on the LIM. If you do it on the car be forewarned, cleaner will get into the cylinders. Remove the feul pump relay and crank the engine to get most of it out before you try to start the engine. Put the relay in and start the engine. lots of smoke will come out of the exhaust. Then change the oil.
If you take the LIM off you won't have this problem but you should get injector O-rings and LIM gaskets in addition to the UIM, TB, and IAC gaskets.
